68. In post #6, HuckleB posts a link, a paragraph is posted in Message text:

"More than 1,100 kilometres to the north, researchers are experimenting with chestnuts that contain genes thought to provide resistance, which were taken from Chinese chestnuts as well as plants such as wheat, peppers and grapes. At the State University of New York in Syracuse, plant pathologist Bill Powell and forest biologist Chuck Maynard have planted some 600 transgenic trees for field trials of disease resistance. A transgenic variety with a wheat gene for the enzyme oxalate oxidase, which disarms the fungus, has already shown resistance in the field."
Nature can not cross breed wheat, peppers or grapes with Chestnuts. (It's not a matter of how much paranoia you stir into the mix...or not.)